frenemy
noun [ C ] informal uk/ˈfren.ə.mi/ us/ˈfren.ə.mi/
假装是朋友，其实是敌人的人
a person who pretends to be your friend but is in fact an enemy
Her only friends are a trio of catty frenemies she hasn't seen in months. 她仅有的朋友是三位好几个月都没见着的出言恶毒的假朋友真敌人。